Differential pattern-machine



(No Model.)

R. CAIRNS. DIFFERENTIAL PATTERN MACHINE- Patented Jan. 15,1895.

.Pattern-Machines; and I do hereby declare in the boxes.

UN TED STATES PATENT OFFICE.

ROBERT CAIRNS, OF-WATERTOWN, WISCONSIN.

DIFFERENTIAL PATTERN-MACHINE.

SPECIFICATION forming part of Letters Patent No. 532,443, dated January 15, 1895. Application filed June 16,1894. SerialN0- (Nomodeh) To all whom it may concern.-

Be it known that 1, ROBERT CAIRNS, a citizen of the United States, and a resident of Watertown, in the county of Jefferson, and in the State of Wisconsin, have invented certain new and useful Improvements in Differential that the following is a full, clear, and exact description thereof.

My invention has for its object to improve the differential pattern machine set forth in my Patent No. 507,783, of October 31, 1893; and it consists in providing said machine with adjustable devices for holding drag and cope sections of various sized flasks-in place during the operation of setting up molds, as will be hereinafter specificallyset forth with reference to the accompanying drawings and subsequently claimed. V

In the drawings: Figure 1 represents a vertical transverse section of a portion of my differential pattern-machine and a flask-section held in place thereon by devices con templated in the present invention; Fig. 2, a plan view partly in section, and Fig. 3 a detail sectional view of another form of adj ustable holding devices for flask-sections.

Referring by letter to the drawings B represents the screw-spindle; M, the table; N, O, the concentric skeleton columns; P, the center-plate; Q, the removable guideway fillers; R, the nut; S, the spider-arms; h, the braces for these arms;T, the'vertical guide-bars; U, the grooved slides V, the pulley-rim pattern; W, the spider-pattern, and X the flask sec tion shown and described in my prior patent.

In carrying out my improvements I provide the table M with'radial ears C at diametrically opposite points, and in one form'of my invention these'ears are employed as supports for boxes D bolted thereto as illustrated in the first two figures, these boxesserving as guides for bars E having offset inner ends provided with upwardly extended pins F, and as a means for locking the bars in any position of their possible longitudinal adjustment clampscrews Gare engaged with tapped openings The pins on the bars are for engagement with openings in ears H projecting from the flask-section X and these cars seat on the offset ends of said bars.

As shown in'Fig. 3, the boxes D may be omitted and each bar E provided with a longitudinal slot for the engagement of guidepins I, J, on the table-ears, the latter one of these guide-pins being screw-threadedto receive a clamp-nut K that serves to lock the bar in adj usted-position.

' From the foregoing it will be seen that the sections of various sized flasks may be seourely locked in place on the machine-table and this has been found of advantage in practice. 7 g

While means herein set forth for the detachable connection of the bars and flasksections are. preferable the same maybe variously modified without departure from my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination of the machine-table provided with guides, bars longitudinally adjustable with relation to theguides, clampin g-devices operative against the bars to lock the same in adjusted position, and suitable means for detachably connecting the inner ends of said bars with a flask-section, substantially as set forth.

2. The combination of the machine-table provided with guides, bars longitudinally adj ustable with relation to the guides and hav- 7 ing offset inner ends, upwardly extended pins on theseoffset ends of the bars, and suitable means for locking the bars in adjusted position, substantially as set'forth.

3. The machine table provided with radial ears at diametrically opposite points, guides on the ears, bars longitudinally adjustable with relation to the guides, suitable means for locking the bars in adjusted position, and other suitable means for detachably connecting said bars and a flask-section, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand, at Watertown, in the county of J efferson' and State of Wisconsin, in the presence of two witnesses.

ROBERT CAIRNS. 

